International Mathematical Olympiad

Timeline

#	Year	Country	City	Date	Countries	Contestants
#	Year	Country	City	Date	Countries	All	M	F
50	2009	Germany	Bremen	10.7. - 22.7.	104	565	506	59
52	2011	Netherlands	Amsterdam	12.7. - 24.7.	101	564	507	57
53	2012	Argentina	Mar del Plata	4.7. - 16.7.	100	548	496	52
51	2010	Kazakhstan	Astana	2.7. - 14.7.	97	523	470	47
49	2008	Spain	Madrid	10.7. - 22.7.	97	535	480	55
48	2007	Vietnam	Hanoi	19.7. - 31.7.	93	520	472	48
46	2005	Mexico	Mérida	8.7. - 19.7.	91	513	470	43
47	2006	Slovenia	Ljubljana	6.7. - 18.7.	90	498	460	38
45	2004	Greece	Athens	6.7. - 18.7.	85	486	348	37
43	2002	United Kingdom	Glasgow	19.7. - 30.7.	84	479	333	37
42	2001	United States of America	Washington	1.7. - 14.7.	83	473	440	33
44	2003	Japan	Tokyo	7.7. - 19.7.	82	457	326	29
41	2000	Republic of Korea	Taejon	13.7. - 25.7.	82	461	330	31
38	1997	Argentina	Mar del Plata	18.7. - 31.7.	82	460	303	28
40	1999	Romania	Bucharest	10.7. - 22.7.	81	450	309	37
39	1998	Taiwan	Taipeh	10.7. - 21.7.	76	419	292	30
37	1996	India	Mumbai	5.7. - 17.7.	75	424	298	25
36	1995	Canada	Toronto	13.7. - 25.7.	73	412	288	26
34	1993	Turkey	Istanbul	13.7. - 24.7.	73	413	282	32
35	1994	Hong Kong	Hong Kong	8.7. - 20.7.	69	385	268	25
33	1992	Russian Federation	Moscow	10.7. - 21.7.	56	322	261	12
32	1991	Sweden	Sigtuna	12.7. - 23.7.	56	318	259	17
31	1990	People's Republic of China	Beijing	8.7. - 19.7.	54	308	223	8
30	1989	Germany	Braunschweig	13.7. - 24.7.	50	291	200	13
29	1988	Australia	Canberra	9.7. - 21.7.	49	268	251	17
28	1987	Cuba	Havanna	5.7. - 16.7.	42	237	154	7
26	1985	Finland	Joutsa	29.6. - 11.7.	38	209	147	7
27	1986	Poland	Warsaw	4.7. - 15.7.	37	210	141	7
25	1984	Czechoslovakia	Prague	29.6. - 10.7.	34	192	126	3
24	1983	France	Paris	1.7. - 12.7.	32	186	178	8
23	1982	Hungary	Budapest	5.7. - 14.7.	30	119	88	2
22	1981	United States of America	Washington	8.7. - 20.7.	27	185	155	9
21	1979	United Kingdom	London	30.6. - 9.7.	23	166	116	1
19	1977	Yugoslavia	Belgrade	1.7. - 13.7.	21	155	132	2
16	1974	German Democratic Republic	Erfurt	4.7. - 17.7.	18	140	124	2
18	1976	Austria	Lienz	7.7. - 21.7.	18	139	117	4
20	1978	Romania	Bucharest	3.7. - 10.7.	17	132	101	3
17	1975	Bulgaria	Burgas	3.7. - 16.7.	17	135	99	2
15	1973	Union of Soviet Socialist Republics	Moscow	5.7. - 16.7.	16	125	115	2
13	1971	Czechoslovakia	Žilina	10.7. - 21.7.	15	115	89	3
14	1972	Poland	Toruń	5.7. - 17.7.	14	107	90	2
11	1969	Romania	Bucharest	5.7. - 20.7.	14	112	95	6
12	1970	Hungary	Keszthely	8.7. - 22.7.	14	112	94	5
9	1967	Yugoslavia	Cetinje	2.7. - 13.7.	13	99	82	1
10	1968	Union of Soviet Socialist Republics	Moscow	5.7. - 18.7.	12	96	88
7	1965	German Democratic Republic	Berlin	3.7. - 13.7.	10	80	63	9
6	1964	Union of Soviet Socialist Republics	Moscow	30.6. - 10.7.	9	72	54	4
8	1966	Bulgaria	Sofia	1.7. - 14.7.	9	72	59	1
5	1963	Poland	Wrocław	5.7. - 13.7.	8	64	53	2
1	1959	Romania	Braşov	21.7. - 31.7.	7	52	41	6
4	1962	Czechoslovakia	České Budějovice	7.7. - 15.7.	7	56	48	4
3	1961	Hungary	Veszprém	6.7. - 16.7.	6	48	34	5
2	1960	Romania	Sinaia	18.7. - 26.7.	5	39	32	1
54	2013	Colombia	Santa Marta	18.7. - 28.7.
56	2015	Thailand
57	2016	Hong Kong
55	2014	South Africa
58	2017	Brazil

Gender of some contestants is not known. Please send relevant information to the webmaster: webmaster@imo-official.org.